Rest available cop



Patented Out. 3, 1922.

E. L. SMALLEY.

ELECTRICALLY HEATED BOILER.

APPLICATION HLED AuG.2. |921.

E. L. SMALLEY.

ELECTRICALLY HEATED BOILER.

MPLICATION HLED AUCLZ. |921. 1,430,927- Patented 00u 3,1922.

@OQQGOO OOGGOQC) @QQQOGQQOQQQQO QQGOOOQQQQQQ@ (Lozun) E. 1 SMALLEY.

ELECTRICALLY HEATED HUILER.

APPLICATION FRED AUG.Z. |921.

rammed 00u 3,1922,

3SHEET5-SHEEI 3- l l l tfouwnl steam by the use of electrica ener my improvement is'directed to boi ers of b Patented Oct. 3, 1922.

n Icls-'sourir entrees. New cansar.'

'ELECTRICALLY-HEATED B01111121.

Application ledingust 2. 1921i." Serial' No. 4892192.

To all u1/wm it may conc-em Be it knowny that I, -Enwnn L. Smm,

a citizen ofthefUnted: States and residentof2401rvng Ave., South"v v the countyv of Essex AandState of NewJerse whichi the following a art of this specication.

= his invention relates-tothe eration ot and the4 fire tube type whchl'provide with resistance conductors, carried within-the boiler tubes rby insulation-'of highly :retracto and dielectric nature, so arranged with re ation boiler heating to the tubes as to eiliciency.

While by no means limited as to the means whereb, electrical energy is generated for l purposes, it is contemplated by t'me to employ-water power as the lprime source of power, because l.'V realize'fthat 'in certain localities where uel is'unavailable,

except at Vhigh cost fory transportation, but

which possess water power, the conversion thereof into heat b v electrical means enables the economical production `of steam 'for power and other commercial uses.

' Therefore my invention e consists of a -boilerl having watersupply means and a series of heater tubes extended within saidv boiler to be surrounded b v1the watertherein. t

Each of said tubes contains a resistance conductor which is supported therein and insulated therefrom by refractory material of suitable character. i

In one example of vmv linvention the insulation mav hein longitudinal sections'of derent diameters. relativelyI large' diameter sections that lit within a 'heater tube alternating with relativelyy small diameter secis an exact .descriptiom frefer= ence being had to thedraxinngsrxvhlch .form f afford maximum heating are nexo 1 an spaced band insulated @relacion from each-other.

vInsulation =-is -'provided -exteriorly of the boiilersvithnpertures for the' passage of the 55 0 y ytexninalsiortheresrective' resistance conhave invented certain fnewJIrprovements-in* Electrically-Heated Boilers, 'of

'a 'Flgure' 1 s 'a sectlon snowing a moditied for f insulating' support. 75

-Figure "i" isY asectio'nalrziew of a further modifiedform of support Figure 8 is a longitudinal, sectlonaleicvationof YAaforr'n of support for the resistance conductoxfcornlosed of'interlitting elements. 80

`Figiufe 9 is a similar, view of a modified form' of support, and' 'Figure 10 is asimilar vi'ew showing a still' lrther modification.

In carrying out my invention 1 provide a 5b boiler-:having: "a cylindrical shell 1, heads Il. heater tubes4 4 erteruied between the heads, lower brace or tie rods 5= and upper brace or tie rods.

The heater tubes 4. which may be of stoel or; other suitable material, each contain a resistance conductor 12. here shown .in the form of return bend coils. which. with the exception of their terminals 13. are entirely enclosed wit-hin the tubes. in which they are suitably supnorted and insulated.

.fisinsulating means I emploi7 material of i highlv refractory nature. having means maintaining the parallelism of the return bend resistance strands and of effectively insulatino' them from each other and from' the metallic' containing tube.

spectively outer and inner localizing insults."-

tion supports for the resistance conductor. To this end the larger sections 14 -must be hollow because the resistance conductor is to lie against its inner surface, but the smaller sections 15 A shown in Figures 3 and as tubular, may be solid in crosssection, since their outer surfaces furnish the supporting means "for, the resistance conductor.

In Figures 3 and 4 I have shown 44the sw tions 15 as liavingexteriorlon itudinal par allel grooves l5* to receive an localize the strands of the resistance conductor, and lin Figures 3 and 5 I have shown the tubular sections 14,. as having internal -lon itudinal parallel grooves 14* to receive an flocaline the same strands at alternate portions of their length. Thus. alternate length portions vof said strands are exposed to the lthe -i containing the resistance conductor and provided with internal insulation material, and the length of exposure for .the resistance conductor strands, between succeeding .larger diameter sections 14 is in. sufficient to Vpermit appreciable sagging of the strands, under heat expansion-,piso that no liability exists for them to 'enter into contact with the wall of their containing tube 4.

In some instances, where the resistance conductor is of very stout sectional character it may not be necessary for both the larger and smaller insulation sections tobe grooved, and I have. in Figure 6, shown a, larger or tubular section 16 as having an ungrooved 'or .plain .inner peripheral surface 16, -to couct with the rooved outer surface -of section 15; and aso, in Figure 7, I have shown a'smoller section 17 as provided with an ungroored or plain outer peripheral surfare 17* to coact with the grooved ,inner surface of section 14.

W'hile the greatestlieat eiciency may be attained by means of the alternate smaller and larger insulating sections my invention also contemplates the employment of .concentric interlitting. 4insulating su ports "of refractory material, which may lie either in abutting sections or of continuous lengths und adapted to contain between them the resistance conductor. Thus, in Figure 8 I have shown a modified form of-support com nosed of an-onter tubular length 1S of insulation material, having the inner ooves 1S,Aand a concentric inner length 19, aving o uter grooves 19*` the grooves 185. and -19 containing between them the strands of c011- ductor ,12.

As indicated by dividi v line 20, these concentric len hs of insu ation material ma if desire be in abutting sections.

n Figure 9, having concentric lengths 21, 22 in interfitted relation, the outer support 21 only may have grooves 21, ,o,r the localizatonofconductor 12; and, in 10, haring similar supports 23, 24, the inner support 24 only may be provided with localizinfr rookies?? for conductor 12.

The oilershell and its heads may be covered for a suitable thickness with heat insuloting material, indicated at 25, plugs 25 of the same material being for convenience litted thereinin the regions of the manholes.

"ilheernnals, of the resistance condnctors 12, extend out through the heat 'insulirtion nnieritl.:95, for inclusion in an electrical circuit which derives its current {roma-source of energy not herein shown.

'Variations mithi-ntle spirit and scope o! my invention are equally commehended Yby the foregoing disclosure:-

I claim;

f1. 'The combination, 4in an electric steam generator, of a slellhavng aseries of heater tubes fitted therein, said tubes containing refractory .insulation in the-formiof long1- t.udi`nal,=butti s'ections,.=alternate sections havingarelative yl'arv r and :smaller Idiameter's,.-the;sections of` erger diameter .being hollow,i, and fai return bend resistance conductor for a heater tube engaging the outer surfaces of :ther-sections offsmaller diameter and the inner surfaces ofthe :sections of larger diameter.

2.- fEhe-combinat-iomin an electric steam genenator-,o'wshellhavi afseries of heater tubes tittedfthereimsaidtu es'cntaining refractory-insulation in `the form of 'longitudine-l, Jabutting sections, alternate sections having relatively lar r and smaller diameters, .'the sections of rger diameter being hollow` and-a return bend resistance oonductor for'aheater tube engaging the ou'ter surfaces of the sections of smaller diameter andthe innersurfaces ofY the sections of larger gdiameter; and `'means -for .-loealizing said.: resistance conductor to lmaintain fthe para llelism, .of .its return bends.

3.; The rcombination, in an electric steam generator, of a shell having-agser-ies of heater tubes -fitted -theroiiu --said tubes containing refractory .insulation vin the form of` longitudinal, abutting sections, Valternate sections having relatively -lar er and-smaller diameters, .the sertionsvolf erger. diameter being lxolloxv and .havinv `parallel .grooves -in their inner surfaces, arid a return-bend'xesistance conductor 4for a heater tube'to engage the grooves in ,the larger sections and the surfaces gif-the sections ohsmaller diameter.

4. fll'hev combination, in amelectricsteam generator, of a shell havingaseries offheater tubes fitted therein, said tubes containing gaging the grooves of the refractory insulation in the form of longisections, alternate sections tudinal, abutting having relatively larger and smaller Adisim- 5 eters, the sections of larger diameter being hollow having parallel grooves, resistance conductor for and the sections of Smaller diameter and a return bend a heater tube ensections of smaller diameter and the inner surfaces of the sec- 10 tions of larger diameter..

Signed at New York, in the county State of New 1921.

and York, this 28th day of July,

Emmi L. SMALLEY. [n s.; 

